QMenuBar {
    background-color: #f5f5f5;
    border-bottom: 1px solid #e0e0e0;
}
QMenuBar::item {
    padding: 6px 12px;
    background: transparent;
}
QMenuBar::item:selected {
    background-color: #e5f3ff;
}
QMenuBar::item:pressed {
    background-color: #cce8ff;
}